does anyone have recommendations for mangas with stories that are connected (ex. the frien...

Try http://www.mangago.zone/read-manga/koakuma_no_sanctuary/ In one chapter all the couples are together

http://www.mangago.zone/read-manga/koi_ni_nare/
http://www.mangago.zone/read-manga/koi_nanka_shitakunai/

http://www.mangago.zone/read-manga/konya_mo_nemurenai/
http://www.mangago.zone/read-manga/kimi_to_kore_kara/

Grouped them together.

okosama star and okosama box

I absolutely love all three of these. They're all connected :)

http://www.mangago.zone/read-manga/puchitto_hajiketa/
http://www.mangago.zone/read-manga/porotto_koboreta/
http://www.mangago.zone/read-manga/korotto_ochita/

http://www.mangago.zone/read-manga/warui_koto_bakkashite_gomennasai/
Here is the series order ...
Vol 1 Warui Koto Shitai [1-1]
Vol 2 Waruiko Demo Ii? [1-2]
Vol 3 Kirai ja nai Kedo [2-1]
Vol 4 Koi Ja nai Kedo [2-2]
--- Warui Koto Bakkashite Gomennasai [1-3 & 2-3]
Vol 5 Warui Yatsu Demo Ii [1-4]
Vol 6 Mujihi na Otoko [3-1]
Vol 7 Warui Koibito ja Dame? [1-5]
Vol 8 Kare ja nai kedo [2-4]
--- Warui ko Tachi no Bansan [1-6 & 2-5]
Vol 9 Mujihi na Anata [3-2]
Vol 10 Sunao ja nai Kedo [2-6]
Vol 11 Warui Ouji Demo Suki [1-7]
Vol 12 Mujihi na Karada [3-3]
Vol 13 Shouwaru Ookami ga Koi wo Shita Rashii

hh company

ah i've read this one and i loved it ^ ^ thanks!

The mc's of these mangas are all friends with each other:
http://www.mangago.zone/read-manga/escape_journey/
http://www.mangago.zone/read-manga/sayonara_futaribocchi_renai_shinsho/
http://www.mangago.zone/read-manga/koi_to_wa_baka_de_aru_koto_da/

Also by the same author (read them in this order):
http://www.mangago.zone/read-manga/azami/
http://www.mangago.zone/read-manga/sabita_yoru_demo_koi_wa_sasayaku/
http://www.mangago.zone/read-manga/renai_rubi_no_tadashii_furikata/ (second story)

The couples in these mangas are all connected to the bar that appears in the story:
http://www.mangago.zone/read-manga/otoshiana_ni_hamerarete/
http://www.mangago.zone/read-manga/pinup_boy/
http://www.mangago.zone/read-manga/yoru_mo_hi_mo_akenai/

The ukes in these are brothers:
http://www.mangago.zone/read-manga/shinobeba_koi/
http://www.mangago.zone/read-manga/nirameba_koi/

Also, you probably already know this, but Sekai ichi hatsukoi is the spin off of Junjou Romantica

http://www.mangago.zone/read-manga/azami/
http://www.mangago.zone/read-manga/sabita_yoru_demo_koi_wa_sasayaku/
http://www.mangago.zone/read-manga/renai_rubi_no_tadashii_furikata/ (second story directly connected to other books, first one is kinda connected to the first story)
http://www.mangago.zone/read-manga/hadakeru_kaibutsu/
In order by time, but I would say read the second one first.

Thanks!

thank you!